Photoshop mockup templates and smart objects

[V_force]

Hello!

Got a question: I use a lot of Photoshop mockup templates with smartphones where I replace a screen with my image. Usually I create the image in Illustrator and add screenshots (for example) emojies there, then export it as PNG (300 resolution) and then add it to the Photoshop mockup via smartobject preset the mockup templates usually have.

Here is the thing: Even if I scale up the file (increase the canvas size), the screen overlay (mockuped image) looks okay. Even if I incresed resolution 3 times. I checked the image zooming in up to 100% and screen overlay image still looks ok.
How is that possible? Or how does this work? Will the screenshoted emojies come out all blurry once printed (size of the poster is 1,5mx1,8 m)? 

Would be amazing if someone could explain to me how it works! ❤️

[c.pfaffenbichler]

Could you please post screenshots taken at View > 100% with the pertinent Panels (Toolbar, Layers, Options Bar, …) visible? 

What is the effective resolution of the image, meaning the actual number ofpixels per unit of length at the final output size? 

[jane-e]

@V_force 

You don't need 300 ppi for posters that are 6 feet wide.

I've copied this from @davescm :

There is a handy formula, based on good eyesight, to work out what ppi is required in order to avoid seeing image pixels.

ppi required = 6878/viewing distance in inches.

So, for example, if your poster will be viewed from say 4 feet away.

The formula gives 6878/48 = 143ppi. At that distance a higher ppi is finer than the eye can resolve.

Going any higher than that is wasted and just increases the chances of introducing resizing artifacts.

See the posts from Dave and @D Fosse in this thread for details:

https://community.adobe.com/t5/photoshop-ecosystem-discussions/photo-blow-up-question/m-p/14419985

Jane

[V_force]

Thank you very much @jane-e 
It's more like I need to meet printer's requirements. But your link answered my questons. ❤️

[jane-e]

You're welcome @V_force , I'm glad it helped!

Jane

[robert_6452]

Hi!

What you're seeing is the magic of smart objects in Photoshop. When you place your PNG into a smart object, Photoshop retains the original resolution, allowing you to scale up without losing quality. That's why everything still looks sharp, even at larger sizes.

However, for a poster as big as 1.5m x 1.8m, there's a risk of blurriness if your PNG isn't high-res enough. To ensure crisp print quality, consider creating your design at a larger size in Illustrator or saving it as a vector file like PDF before placing it in Photoshop.

Hope this helps!